Which division of the autonomic nervous system would likely be activated if a student learned that an exam they had forgotten about would start in 5 minutes? Explain.
Which division of the autonomic nervous system would likely be activated if a student learned that an exam they had forgotten about would start in 5 minutes? Explain.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:• Which division of the autonomic nervous system would likely be activated if a
student learned that an exam they had forgotten about would start in 5
minutes? Explain.
• Which one of the five categories of sensory receptors is primarily dedicated
to external stimuli?
• Explain what is happening here in muscle contraction. Be sure to tell me
what role Ca+, ATP, myosin, and actin play.
Thin filaments
feee
Binding of a new mol-
ecule of ATP releases the
myosin head from actin,
and a new cycle begins.
Thick filament
Thin filament moves
toward center of sarcomere.
Myosin head (low-
energy configuration)
Releasing ADP and ℗. myosin
returns to its low-energy configuration,
sliding the thin filament
Starting here, the myosin head
is bound to ATP and is in its
low-energy configuration.
-Myosin head (low-
energy configuration)
Cross-bridge
Thin filament
Thick
filament
Actin
The myosin head hydrolyzes
ATP to ADP and inorganic
phosphate () and is in its
high-energy configuration.
Myosin
binding sites
-Myosin head (high-
energy configuration)
The myosin head binds
to actin, forming a
cross-bridge.
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